Form clamp



May 3. 1927.

W. C. GIGGAL FORM GQAMP Filed Aug. 4, 1924 .V EN TOR.

Patented M ay 3, 1927.'

` WILLIAMLC. GIGGAL, vor nnnvnafconoaanol j romaf mmm. t.

` Applicatieiimed August-e, 192e:serial-v.iolwzeaasvei:;v

p This invention' relates to clampsffornuse` in assemblln'gfitlie'fcomponent parts'iof fa mold or rform `of theltype l employed 1 in construct-v` ing columns-and @otherl lslmilarl structures 1 of l concrete lor other/'plastici material.

It is an object of tl'ieinvention Atdprmzitle a clamp of this character which will insurera true' an gular' relation 'fof the f' assembled parts of the concrete mold to which it: is ap-JF plied,fi"n afsimplefmanner-fandrwithout intricate adjustment or measurement and another object is to form a clamp of the above stated characteristics of two simple members coo eratively connected and relatively adjusta le for the application of the clamp to forms of different cross-sectional areas.

A further object of the invention is to provide in association with the clamp members, a lever of novel form to forcibly adjust the members tov their proper relative position around the mold and still other objects reside in details of construction hereinafter described and shown in the accompanying drawings in the several views of which like parts have been similarly designated.

In the drawings, v

Figure 1 represents a perspective view of the clamp with the parts thereof relativelydisposed and connected for application to a concrete form;

Figure 2, a fragmentary elevation of a concrete form, showing two of my improved clamps in place thereon;

Figure 3, a section along the line 3 3, Figure 2, drawn to an enlarged scale; Y

Figure 4, an enlarged fragmentary section taken on the line 4 4, Figure 1; and

"Figure 5, an enlarged fragmentary section along the line 5-5, Figure 1. f

Referring more in detail to the drawings, 5 designates a mold for forming Vcolumns of rectangular section, comprising four upright members 6 preferably composed of boards.

The members are held. to ether in true rectangular formation by a p urality of my improved clamps applied at different elevations thereof.

Each clamp consists of two co-ordinating angular sections 7 identical in construction and composed of a plurality of members rigidly connected at an angle to each other which corresponds with an angle of the concrete form to which the clamp is applied.

In the form of my invention shown in theV drawings, the members of the clamp-sections are relatively disposed to form a square 'clamps may likewise be employed in thecons-fstructionn of;y molds ywhich f are :of .different polygonal shapefin cross-section. :i

Each section of the clamp` consists double @strap-'members 8- and 'ifa' singlfr 'Strap member r9: rigidlyifas'tenedetogetlier at ,Ifiglrt,-fl

angleseto reach; ethereby'rivets-i10 appliedSaitY` and 3, the two sections are pivot'ally fastened v together by a pln 14 inserted in alined corresponding apertures of two of its 4members which cross each other at a distance from the opposite members of the sections, equal to the external widthv ofthe form.

The clamp is then placed around the form and a lever is fulcrumed by means of a pin, 16 in opposite apertures of the free double member 8 of one of the sections to engage 'with the outer edge of the corresponding single member 9 of the other section.

The lever consists of a bar 15 having at one end a notch 15a to straddle the edgeportion of the strap-member 9 of the clamp as best shown in Figure 5, and at a compara'- tively short distance from saidcnotch it has an. aperture 15c to receive the pin 16.` The lever 15 which is provided at its engaging end with spaced Sides or flanges and a connecting web or portion, is provided in the web with the recess or notch 15, which eX- tends longitudinally of the lever. The side walls of the -notch or recess 15a preferably converge inwardly as shown in Fig. 5,

It willl be evident that by pivotal move- The menabers of the sections thus connecty ed are in true rectangular formation and Vthe clamp will securely hold the parts of the .form in their proper relative position and against displacement or deformation by the expansive pressure of the plastic ma# Having thus described my invention, what I claim and desire to secure' by Letters Patent is:

A clamp comprising a rectangular frame composed of bars crossed at the cornersv of the frame and'extendedl beyond the same, the

bars at t-Wo opposite sides of the framebeing arranged in pairs and the bars at the other sides of the frame being 'single bars, means for rigidly connecting the extended ends at two diagonally opposite corners cf the frame, the extendedV ends of the bars at the other two corners of the frame being provided at intervals with perforations for the receptionoi pins, andV a lever for adjusting the bars, said lever being pivoted near one end between they-pair of bars atene corner ofthe frame and provided at the pivoted end with a notch. extending longitudinally of the lever and permit-tingvthe lever tov Y straddle the adjacent single bar for fuly cruming the lever against-the outer edge thereof. l

In testimony whereof IV haveaiiied :Y

f Y WILLIAM e. GIGeniL.`

signatur-e. y 

